\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}60 seconds in a minute X 60 minutes in an hour X 24 hours in a day = 86,400 seconds in a ''metric day'' / 100 = 864 seconds in a ''metric hour''\end{equation*}
\end{document}
